Sharkcano! National Geographic ocean engineer Brennan Phillips sent a camera into Kavachi, an active underwater volcano in the Solomon Islands. He was surprised to find species of sharks living in the volcanic plume.
They also filmed jellyfish and a rare live sleeper shark, according to a related article. Because he is an engineer, not a marine biologist, he could not explain what they did during a full eruption, or if they could sense if it would happen. "The deeper you go, the stranger it gets," he said.